GrapheneOS That is a good question! Thank you! It is possible. I ordered it on ebay from a seller with 600+ and 100% positive feedback. It came as advertised, new in box, with all accessories, all in their pre-used state. It was preinstalled with GOS, and just under $400, so a good deal in my mind after all the horsesh*t I've been through the past month and a half. It all appears legit. Though, I have reinstalled GOS in case something went squirrelly with the initial install, and also because I don't exercise much blind trust. I haven't tried to set up the TMobile SIM yet as I'm second-guessing whether or not I want to jeopardize my privacy to that degree, Privacy being first on my list, Security close second... to me, they are really one and the same, but choices must be made, so.... The first thing that I looked at was the APN settings as I have experienced that as an issue in the past. When I opened the APN settings, not all of the appropriate fields were filled in, so that's why I installed them, from the TMobile site, manually. It didn't work, gave the same "Emergency Calls Only" and "Phone not allowed for voice" messages, but no other alerts that would prompt me to consider I may be in possession of a stolen phone. I don't believe it is, as the seller is one who does this on the regular and I don't know where he would have stolen so many phones in this condition.